Mapquest UK?

Although I haven't as of yet bought my iPhone 4 I have been downloading various apps through iTunes in preparation for the big day.

As a resident of the UK I have only been able to download UK licensed apps, that was until I created as US iTunes account and downloaded Sirius XM and other US restricted apps. One of the apps I downloaded was Mapquest, after reading a great review I thought I would snap it up, now my question is does the Mapquest app work as well as it does in the UK (map rendering, street by street annnouncements) as it does in the US?